;
(function() {
  function setAdaption(baseFontsize) {
    baseFontsize = baseFontsize || 7.5;
    var docEl = document.documentElement;
    var refresh = function() {
      var dpr = window.devicePixelRatio,
        deviceWidth = docEl.getBoundingClientRect().width,
        deviceFontsize = deviceWidth / baseFontsize + "px";
      docEl.setAttribute('data-dpr', dpr);
      docEl.style.fontSize = deviceFontsize;
    };
    window.addEventListener('resize', function() {
      refresh();
      return;
    }, false);
    refresh();
  }

  var browser = {
    versions: function() {
      var u = navigator.userAgent,
        app = navigator.appVersion;
      return { //移动终端浏览器版本信息
        trident: u.indexOf('Trident') > -1, //IE内核
        presto: u.indexOf('Presto') > -1, //opera内核
        webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核
        gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核
        mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
        ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端
        android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android终端或者uc浏览器
        iPhone: u.indexOf('iPhone') > -1, //是否为iPhone或者QQHD浏览器
        iPad: u.indexOf('iPad') > -1, //是否iPad
        webApp: u.indexOf('Safari') == -1 //是否web应该程序，没有头部与底部
      };
    }(),
    language: (navigator.browserLanguage || navigator.language).toLowerCase()
  };
  if (browser.versions.mobile) {
    setAdaption(7.5)
  }
})();
